I shoot 100/200/300/400 and 600 BR matches at various clubs around Ohio and Indiana. I turn the necks on almost all my ammo but always running into an issue of getting a fare at the end of the neck which causes issues with closing the bolt when shooting. When turning the necks I measure closely and cut the neck thickness according to my math. I want about .002 max clearance so on a .269 barrel I would cut for a 6mm bullet 269-243=26. Clearance 26-2=24 or 12 per side. I would love to cut my brass at 12 and call it a day but when I do I end up with a couple more thousands of lip/flare which causes me to force the bullet into the chamber. I'm using SAC modular dies with shoulder bushings and a mandrel so I can dictate my neck tension and run that die on a Prazipress. I have used other dies (PMA Body) with Redding bushings but still end up with the same flare in the neck. I use an inline Sinclair seating die but have also used Redding micro adj seating dies and both have resulted in a fare in the neck. I have attempted to seat really slowly and carefully and also quickly but in every case I still have a flare. I have asked around a bit to other shooters and to my amazement no one else is experiencing this issue???? On person had an interesting theory about the root cause being that I use a wet rotary drum and SS pins to clean my brass. I just don't see how using water to clean the brass can cause a flare in the neck when seating the bullets. Anyone else having this issue or know what the remedy is? Using Lapua brass and use inductive annealer between every shot.
Flare at End of the Brass Neck
- Thread starter PeaShooter
- Start date
What are you using to turn your brass?
Pictures might help. Is the flare only happening when you seat the bullet or is it happening during sizing? The one thing that causes flares for me is trying to size down too much at one time. Like when I size down 6.5 to 6mm or on down to 22 and try to do more than about .005" at a time. That has caused flares for me. I'm not too familiar with the SAC dies. Can you possibly have their expander rod set to deep or is that even possible?
This really shouldn't be in the competition forum FYI. Reloading would probably get you more replies however, maybe not anymore actual help...
This really shouldn't be in the competition forum FYI. Reloading would probably get you more replies however, maybe not anymore actual help...
By the end of the neck comment, are you meaning at the mouth or the brass or at the shoulder junction ?
At the end/mouth it is usually caused by bad die adjustment, screwed down to far.
At the shoulder junction it is usually caused with sizing down and forming a donut effect.
If possible show a photo of the brass and issue you are having. Someone can then really give a opinion on cause.
At the end/mouth it is usually caused by bad die adjustment, screwed down to far.
At the shoulder junction it is usually caused with sizing down and forming a donut effect.
If possible show a photo of the brass and issue you are having. Someone can then really give a opinion on cause.
I use a dedicated LEE decap die in a separate process that only does decapping. The brass does not bottom out. Its a mile away from bottoming out. I always anneal so couldn't answer that question.
Only happens during the seating operation. Working at the moment but prolly can come up with some pic of what's happening.
Yes, I get the flare at the case mouth when necking cases down from say 6.5 to 6mm or 22 but it goes away entirely once fired. Never really understood why it happens but I just accept it and deal with it until fired once. I don't get it under normal sizing, say from .001-.006" of neck tension. I typically use from .002-.004 with most cartridges.
If you zoom in on the brass pic you can easily see the flare. The pic turned out really good to show the flare. Of course this is one of the worst of the bunch.
Attachments
Mine look just like yours but happened when necking down only. Never when seating and never after first firing.
6BRA
Gold $$ Contributor
How did you get a .2605 reading on a .2435 bullet in .024 brass? What does a piece of resized brass measure at all points on neck without a seated bullet? My initial thoughts are you are running around .006 to .008 neck tension. Flat base bullet? Would you happen to have pin guages to check that neck bushing?
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jghoghunter
Gold $$ Contributor
Bad deburring tools. Dull tools. Just went thru this during the summer. Took a long time to figure out the cause.
The neck looks pink in the pic, is it? What type of seating die are you using? Is seating die screwed in too far maybe? Try backing die out a turn to see if it still happens. I think the .2605 is the reading at the neck under the flare. Which would be correct for a .262" chamber. It's the reading a the mouth .2685" with the bullet that's out of whack. Too much for a .262" chamber.
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That's exactly what happened to my F Open team mate. The pins were peening over the case mouth preventing the round chambering.
Coyotefurharvester
Silver $$ Contributor
That booger in the case mouth would/should be noticed before seating(feel it even). If it is only after seating the case mouth is making contact with the die.
Looks like a piece of brass has broken out of the neck rim too. Sure looks like a crimping seating die turned down too far, but does a Sinclair in-line die even have that feature?
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